Wheatgrass juice storage time?

[raweater]

Raw juices normally only last 2-3 days and that's if you have a slow juicer, but my health food store started selling raw wheatgrass juice and the shelf life is over 2 weeks.

Is it due to the high nutrition of wheatgrass that it lasts so long even when raw?

[raweater]

This is the company's site:

http://gardengatefarms.com/products.html

[Aleesha Sattva]

i can't imagine it would stay fresh and healthy that long. but i have no knowledge behind that assumption...